EP1032970B1 - Monolithic high frequency voltage controlled oscillator trimming circuit - Google Patents
Monolithic high frequency voltage controlled oscillator trimming circuit Download PDFInfo
- Publication number
- EP1032970B1 EP1032970B1 EP98958422A EP98958422A EP1032970B1 EP 1032970 B1 EP1032970 B1 EP 1032970B1 EP 98958422 A EP98958422 A EP 98958422A EP 98958422 A EP98958422 A EP 98958422A EP 1032970 B1 EP1032970 B1 EP 1032970B1
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- EP
- European Patent Office
- Prior art keywords
- diode
- terminal
- capacitance
- capacitor
- differential input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1206—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification
- H03B5/1209—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier having two current paths operating in a differential manner and a current source or degeneration circuit in common to both paths, e.g. a long-tailed pair.
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
- H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
- H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
- H03B2201/02—Varying the frequency of the oscillations by electronic means
- H03B2201/025—Varying the frequency of the oscillations by electronic means the means being an electronic switch for switching in or out oscillator elements
- H03B2201/0258—Varying the frequency of the oscillations by electronic means the means being an electronic switch for switching in or out oscillator elements the means comprising a diode
Definitions
- the present invention pertains in general to trimming circuits for voltage controlled oscillators and, more particularly, to a trimming circuit operable at high frequencies and capable of integration with a voltage controlled oscillator on a single semiconductor integrated circuit chip.
- Trimming a center frequency of a voltage controlled oscillator is typically performed through the use of an external trimming circuit.
- the trimming circuit is located external to the voltage controlled oscillator on a discrete circuit to simplify adjustment of a resonance frequency.
- Trimming circuits currently can be placed on a single semiconductor chip with the voltage controlled oscillator through the use of a variable capacitor.
- a digital to analog converter is connected to a variable capacitor and a desired capacitance value associated with a desired center frequency is programmed into the digital to analog converter.
- the analog output of the digital to analog converter adjusts the variable capacitor in response to the programmed capacitance value thereby varying the resonance frequency of the trimming circuit.
- the new resonance frequency adjusts the center frequency of the voltage controlled oscillator.
- diode switches Another approach to varying the capacitance of the trimming circuit is through the use of diode switches. While diode switches have been used to connect and disconnect different capacitances to the trimming circuit, the diodes are constructed of discrete PIN diodes separate from the remaining oscillator functionality. The PIN diodes are not integrated onto a semiconductor chip with the oscillator since PIN diodes require a special process to fabricate which is not conducive to bulk integration.
- a first frequency-determining element comprises a first capacitance which can be connected in parallel with a second capacitance as the second frequency-determining element, preferably via at least one switching diode, which can be switched by simple means between a conducting and a blocked state and can be integrated on a semiconductor body with other oscillator components.
- a high-frequency electronic switch with respect to Fig. 1a which involves a single diode coupled by a first capacitor to one high frequency signal terminal and by a second capacitor to a second high-frequency signal terminal.
- Ground or DC bias can be applied to the diode terminals via resistors from two control terminals and the diode can be made conducting or non-conducting as a result.
- a trimming circuit operable at high frequencies and capable of integration with a voltage controlled oscillator on a single semiconductor chip. It would be further advantageous if such a circuit included a diode switch capable of operation at frequencies above two gigahertz and further capable of integration with the voltage controlled oscillator on a bipolar metal oxide semiconductor.
- a monolithic high frequency voltage controlled trimming circuit comprising:
- the trimming circuit 100 is connected to an active network 110 of the voltage controlled oscillator via a differential signal pair comprising a first differential input signal 120 and a second differential input signal 130.
- the trimming circuit 100 comprises a plurality of capacitance loops 140.
- Each capacitance loop includes a first capacitor 150, a second capacitor 155, a first diode 159 and a second diode 160.
- Each capacitance loop 140 is formed by connecting the first differential input signal 120 of the active metwork 110 to a first terminal of the first capacitor 150.
- a second terminal of the first capacitor 150 is connected to a first terminal of the first diode 159 and a second terminal of the diode 159 is connected to a first terminal of a second diode 160.
- a second terminal of the second diode 160 is connected to a first terminal of the second capacitor 155 and a second terminal of the second capacitor 155 is connected to the second differential input signal 130 of the active network 110.
- each capacitance loop 140 Connected to each capacitance loop 140 is a first resistor 175 and a second resistor 176.
- the controller 180 is also connected to the second terminal of the first diode 159 and the first terminal of the second diode 160 to apply a biasing voltage.
- a first terminal of the first resistor 175 is connected to the second terminal of the second diode 160 and the first terminal of the second capacitor 155 while a second terminal of the first resistor 175 is connected to a voltage source 190.
- a first terminal of the second resistor 176 is connected to the first terminal of the first diode 159 and the second terminal of the first capacitor 150 and a second terminal of the second resistor 176 is connected to the voltage source 190.
- the voltage source 190 applies a reference voltage to the second terminal of the second diode 160 and the first terminal of the first diode 159 via the first resistor 175 and the second resistor 176.
- the controller 180 applies a voltage to the second terminal of the first diode and the first terminal of the second diode such that the voltages applied by the controller 180, the first resistor 175 and the second resistor 176 apply a forward biasing voltage across the first diode 159 and the second diode 160.
- the first diode 159 and the second diode 160 are electrically conductive resulting in the first capacitor 150 and the second capacitor 155 being selectively connected across the differential signal pair of the active network 110.
- the first capacitor 150 and the second capacitor 155 function to block direct current voltages created by the controller 180, the first resistor 175 and the second resistor 176 from being applied to the first differential input signal 120 and the second differential input signal 130. Blocking these voltages, prevents direct current voltages from one capacitance loop 140 from being applied to the first diode 159 and the second diode 160 of other capacitance loops 140.
- the first diode 159 and the second diode 160 are nonconductive. Furthermore, values for the first resistor 175 and the second resistor 176 are chosen such that the first resistor 175 and the second resistor 176 have relatively high resistance values, for example on the order of several thousand ohms. Therefore, although there is an electrical path completed between the first differential input signal 120 and the second differential input signal 130 through the first resistor 175 and the second resistor 176 when the first diode 159 and the second diode 160 are reverse biased, the high resistance values result in the capacitance loop 140 being essentially disconnected from the differential input pair.
- the first diode 159 and the second diode 160 require specific operating characteristics.
- An ideal diode for use in this application posses the following characteristics: a low series resistance r s during operation in a forward biased state, a long transit time 1/ ⁇ and a low reverse biased junction capacitance C jo .
- expensive semiconductor devices such as Gallium Arsenide (GaS) could be used to construct an integrated circuit chip incorporating the trimming circuit and the voltage controlled oscillator, such a device would be prohibitively expensive.
- GaS Gallium Arsenide
- an inexpensive diode meeting these requirements is fabricated using a Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) manufacturing process.
- BiCMOS Bipolar Complementary Metal Oxide Semiconductor
- ESD Electo-Static Discharge
- bipolar complementary metal oxide semiconductors posses the desired characteristics.
- an electro-static discharge protection diode catalogued as DB100W posses a series resistance r s equal to three ohms in the forward biased state, a r equal to five nanoseconds and a reverse bias junction capacitance C jo equal to one hundred twenty six femtofarads.
- this diode In the reversed bias state, this diode has a junction capacitance of approximately fifty femtofarads at a reverse bias voltage of approximately one volt. Further information regarding the design and operation of these electro-static discharge protection diodes can be found in the Philips Qubic 1 design manual or other similar bipolar complementary metal oxide semiconductor design manuals.
- bipolar complementary metal oxide semiconductor electro-static discharge protection diodes of this type are inexpensive to manufacture and are easily incorporated into a single semiconductor chip with other functionality of the transceiver.
- bipolar complementary metal oxide semiconductor diodes for electro-static discharge protection is well known, their use as a diode for providing high speed "on-chip" switching functionality has not previously been taught in the industry.
- the embodiment described in Figure 1 depicts the use of a first diode 159 and a second diode 160. While two diodes are used to provide balancing between the first differential input signal 120 and the second differential input signal 130 and also to provide better isolation, an alternative embodiment uses a single diode instead. The use of one diode is accomplished by removing the first diode 159 and the associated second resistor 176.
- the alternative embodiment also includes the addition of resistor 170 whose first terminal is connected to the controller 180 and whose second terminal is connected to the second terminal of the first diode 159 and the first terminal of the second diode 160.
- the alternative embodiment functions in a similar manner as the first embodiment described in Figure 1, however, it has the advantage of requiring fewer components and has a lower series resistance since only one diode is used.
- the first embodiment has the advantage of providing better isolation and balances the differential signals.
- FIG. 1 and 2 depict the cathode of the first diode 159 and the cathode of the second diode 160 as being connected to the controller 180 or the terminal of the resistor 170 respectively, in another alternative embodiment (not shown), the anode of the first diode 159 and the anode of the second diode 160 are instead connected to the controller 180 or the terminal of the resistor 170 respectively.
- the polarity of voltages applied to the first diode 159 and the second diode 160 by the controller 180 and the voltage source 190 are reversed accordingly.
Abstract
Description
- The present invention pertains in general to trimming circuits for voltage controlled oscillators and, more particularly, to a trimming circuit operable at high frequencies and capable of integration with a voltage controlled oscillator on a single semiconductor integrated circuit chip.
- Trimming a center frequency of a voltage controlled oscillator is typically performed through the use of an external trimming circuit. The trimming circuit is located external to the voltage controlled oscillator on a discrete circuit to simplify adjustment of a resonance frequency. Today, however, there are increased demands to reduce the size and cost of radio equipment particularly in the radio telephone industry. To reduce the size and cost of the radio equipment, more and more functionality is being incorporated onto a single integrated circuit chip. For this reason it is desirable to integrate the trimming circuit onto a single integrated circuit chip together with the voltage controlled oscillator.
- Trimming circuits currently can be placed on a single semiconductor chip with the voltage controlled oscillator through the use of a variable capacitor. A digital to analog converter is connected to a variable capacitor and a desired capacitance value associated with a desired center frequency is programmed into the digital to analog converter. The analog output of the digital to analog converter adjusts the variable capacitor in response to the programmed capacitance value thereby varying the resonance frequency of the trimming circuit. In turn, the new resonance frequency adjusts the center frequency of the voltage controlled oscillator.
- Problems arise, however, as the supply voltage is decreased or when a wide trimming frequency range is desired. At low power supply voltages increasingly used in radio telephone equipment, for example two and seven tenths volts, it becomes very difficult to obtain the required trimming frequency range with currently available "on-chip" variable capacitors. Furthermore, as the desired trimming frequency range increases, noise created by the digital to analog converter used to adjust the variable capacitor becomes problematic. The inputs to the trimming circuit and the associated voltage controlled oscillator become increasingly sensitive as the trimming frequency range is increased requiring the level of noise created by the digital to analog converter to be kept extremely low. Therefore, as the trimming frequency range increases, it becomes increasingly difficult and expensive to design and manufacture the digital to analog circuit.
- Another approach to varying the capacitance of the trimming circuit is through the use of diode switches. While diode switches have been used to connect and disconnect different capacitances to the trimming circuit, the diodes are constructed of discrete PIN diodes separate from the remaining oscillator functionality. The PIN diodes are not integrated onto a semiconductor chip with the oscillator since PIN diodes require a special process to fabricate which is not conducive to bulk integration.
- From US-A-5 434 543 there is known an oscillator, particularly for use in video signal processing, which is switchable and tunable to at least two oscillation frequencies. A first frequency-determining element comprises a first capacitance which can be connected in parallel with a second capacitance as the second frequency-determining element, preferably via at least one switching diode, which can be switched by simple means between a conducting and a blocked state and can be integrated on a semiconductor body with other oscillator components.
- In GB-A-2 033 181 there is described a high-frequency electronic switch with respect to Fig. 1a which involves a single diode coupled by a first capacitor to one high frequency signal terminal and by a second capacitor to a second high-frequency signal terminal. Ground or DC bias can be applied to the diode terminals via resistors from two control terminals and the diode can be made conducting or non-conducting as a result.
- It would be advantageous, therefore, to devise a trimming circuit operable at high frequencies and capable of integration with a voltage controlled oscillator on a single semiconductor chip. It would be further advantageous if such a circuit included a diode switch capable of operation at frequencies above two gigahertz and further capable of integration with the voltage controlled oscillator on a bipolar metal oxide semiconductor.
- According to the present invention there is provided a monolithic high frequency voltage controlled trimming circuit comprising:
- a plurality of capacitance loops selectively
connectable between first and second terminals of a
differential input of a voltage oscillator active
network;
and - a controller; and wherein each capacitance loop includes a series connection of a first capacitor, at least one diode and a second capacitor, a first terminal of the first capacitor being connected to the first terminal of the differential input, a first terminal of the second capacitor being connected to a first terminal of said at least one diode, a second terminal of the second capacitor being connected to the second terminal of the differential input, and a second terminal of said at least one diode being connected to the controller which serves to apply a forward biasing voltage to said at least one diode of a selected loop for selectively connecting that loop to the differential input.
-
- For a more complete understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings wherein:
- FIGURE 1 is a functional block diagram of a high frequency voltage controlled oscillator trimming circuit including a diode switch operable at high frequencies; and
- FIGURE 2 is functional block diagram of an alternative embodiment of the voltage controlled oscillator trimming circuit described in Figure 1.
-
- Referring now to Figure 1, there is illustrated a functional block diagram of a high frequency voltage controlled
oscillator trimming circuit 100. Thetrimming circuit 100 is connected to anactive network 110 of the voltage controlled oscillator via a differential signal pair comprising a firstdifferential input signal 120 and a seconddifferential input signal 130. Thetrimming circuit 100 comprises a plurality ofcapacitance loops 140. Each capacitance loop includes afirst capacitor 150, asecond capacitor 155, afirst diode 159 and asecond diode 160. Eachcapacitance loop 140 is formed by connecting the firstdifferential input signal 120 of theactive metwork 110 to a first terminal of thefirst capacitor 150. A second terminal of thefirst capacitor 150 is connected to a first terminal of thefirst diode 159 and a second terminal of thediode 159 is connected to a first terminal of asecond diode 160. A second terminal of thesecond diode 160 is connected to a first terminal of thesecond capacitor 155 and a second terminal of thesecond capacitor 155 is connected to the seconddifferential input signal 130 of theactive network 110. - Connected to each
capacitance loop 140 is afirst resistor 175 and asecond resistor 176. Thecontroller 180 is also connected to the second terminal of thefirst diode 159 and the first terminal of thesecond diode 160 to apply a biasing voltage. A first terminal of thefirst resistor 175 is connected to the second terminal of thesecond diode 160 and the first terminal of thesecond capacitor 155 while a second terminal of thefirst resistor 175 is connected to avoltage source 190. A first terminal of thesecond resistor 176 is connected to the first terminal of thefirst diode 159 and the second terminal of thefirst capacitor 150 and a second terminal of thesecond resistor 176 is connected to thevoltage source 190. - The
voltage source 190 applies a reference voltage to the second terminal of thesecond diode 160 and the first terminal of thefirst diode 159 via thefirst resistor 175 and thesecond resistor 176. To selectively connect one or more of thecapacitance loops 140 to theactive network 110 thecontroller 180 applies a voltage to the second terminal of the first diode and the first terminal of the second diode such that the voltages applied by thecontroller 180, thefirst resistor 175 and thesecond resistor 176 apply a forward biasing voltage across thefirst diode 159 and thesecond diode 160. - In a forward biased state, the
first diode 159 and thesecond diode 160 are electrically conductive resulting in thefirst capacitor 150 and thesecond capacitor 155 being selectively connected across the differential signal pair of theactive network 110. In addition to providing capacitance for the trimming circuit, thefirst capacitor 150 and thesecond capacitor 155 function to block direct current voltages created by thecontroller 180, thefirst resistor 175 and thesecond resistor 176 from being applied to the firstdifferential input signal 120 and the seconddifferential input signal 130. Blocking these voltages, prevents direct current voltages from onecapacitance loop 140 from being applied to thefirst diode 159 and thesecond diode 160 ofother capacitance loops 140. - In a reverse biased state, the
first diode 159 and thesecond diode 160 are nonconductive. Furthermore, values for thefirst resistor 175 and thesecond resistor 176 are chosen such that thefirst resistor 175 and thesecond resistor 176 have relatively high resistance values, for example on the order of several thousand ohms. Therefore, although there is an electrical path completed between the firstdifferential input signal 120 and the seconddifferential input signal 130 through thefirst resistor 175 and thesecond resistor 176 when thefirst diode 159 and thesecond diode 160 are reverse biased, the high resistance values result in thecapacitance loop 140 being essentially disconnected from the differential input pair. - To operate at relatively high frequencies, for example above two gigahertz, the
first diode 159 and thesecond diode 160 require specific operating characteristics. An ideal diode for use in this application posses the following characteristics: a low series resistance rs during operation in a forward biased state, a long transit time 1/τ and a low reverse biased junction capacitance Cjo. Although expensive semiconductor devices such as Gallium Arsenide (GaS) could be used to construct an integrated circuit chip incorporating the trimming circuit and the voltage controlled oscillator, such a device would be prohibitively expensive. - In the preferred embodiment of the present invention, an inexpensive diode meeting these requirements is fabricated using a Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) manufacturing process. Although not used as a circuit switches, diodes currently used for Electo-Static Discharge (ESD) protection in bipolar complementary metal oxide semiconductors posses the desired characteristics. For example, in the Philips Qubic 1 silicon chip manufacturing process, an electro-static discharge protection diode catalogued as DB100W posses a series resistance rs equal to three ohms in the forward biased state, a r equal to five nanoseconds and a reverse bias junction capacitance Cjo equal to one hundred twenty six femtofarads. These values are sufficient for operation in the preferred embodiment of the present invention at frequencies above three hundred megahertz. In the reversed bias state, this diode has a junction capacitance of approximately fifty femtofarads at a reverse bias voltage of approximately one volt. Further information regarding the design and operation of these electro-static discharge protection diodes can be found in the Philips Qubic 1 design manual or other similar bipolar complementary metal oxide semiconductor design manuals.
- In addition to operating at the desired frequencies, bipolar complementary metal oxide semiconductor electro-static discharge protection diodes of this type are inexpensive to manufacture and are easily incorporated into a single semiconductor chip with other functionality of the transceiver. Although the use of bipolar complementary metal oxide semiconductor diodes for electro-static discharge protection is well known, their use as a diode for providing high speed "on-chip" switching functionality has not previously been taught in the industry.
- Referring additionally now to Figure 2, there is illustrated a functional block diagram of an alternative embodiment of the voltage controlled oscillator timing circuit described in Figure 1.
- The embodiment described in Figure 1, depicts the use of a
first diode 159 and asecond diode 160. While two diodes are used to provide balancing between the firstdifferential input signal 120 and the seconddifferential input signal 130 and also to provide better isolation, an alternative embodiment uses a single diode instead. The use of one diode is accomplished by removing thefirst diode 159 and the associatedsecond resistor 176. - The alternative embodiment also includes the addition of
resistor 170 whose first terminal is connected to thecontroller 180 and whose second terminal is connected to the second terminal of thefirst diode 159 and the first terminal of thesecond diode 160. The alternative embodiment functions in a similar manner as the first embodiment described in Figure 1, however, it has the advantage of requiring fewer components and has a lower series resistance since only one diode is used. On the other hand, the first embodiment has the advantage of providing better isolation and balances the differential signals. - The preferred embodiment described in Figures 1 and 2 depict the cathode of the
first diode 159 and the cathode of thesecond diode 160 as being connected to thecontroller 180 or the terminal of theresistor 170 respectively, in another alternative embodiment (not shown), the anode of thefirst diode 159 and the anode of thesecond diode 160 are instead connected to thecontroller 180 or the terminal of theresistor 170 respectively. In this alternative embodiment, the polarity of voltages applied to thefirst diode 159 and thesecond diode 160 by thecontroller 180 and thevoltage source 190 are reversed accordingly. - Although preferred embodiments of the method and apparatus of the present invention have been illustrated in the accompanying Drawings and described in the foregoing Detailed Description, it is understood that the invention is not limited to the embodiments disclosed, but is capable of numerous rearrangements, modifications, and substitutions without departing from the scope of the invention as set forth and defined by the following claims.
Claims (7)
- A monolithic high frequency voltage controlled trimming circuit comprising:a plurality of capacitance loops (140) selectively connectable between first and second terminals (120, 130) of a differential input of a voltage oscillator active network (110) ; anda controller (180);
- The circuit recited in Claim 1, further comprising a voltage source (190) connected to the first terminal of said at least one diode (160), the voltage source serving to apply a reference voltage to said first terminal of said at least one diode.
- The circuit recited in Claim 2, wherein each capacitance loop includes a first (159) and a second (160) diode connected in series between the first and second capacitors (150, 155), the at least one diode comprising the first and the second diodes, the second terminal of the first capacitor (150) being connected to a first terminal of the first diode (159), and a second terminal of the first diode (159) being connected to the second terminal of the second diode (160).
- The circuit recited in Claim 3, further comprising:a first resistor (175) connected between the voltage source (190) and the first terminal of the second diode (160); anda second resistor (176) connected between the voltage source (190) and the first terminal of the first diode (159).
- The circuit as recited in Claim 2, wherein each said loop includes only one said diode (160) and further comprising:a first resistor (175) connected between the voltage source (190) and the first terminal of the one said diode (160); anda second resistor (170) connected between the controller (180) and the second terminal of the one said diode (160).
- The circuit as recited in Claim 5, wherein the first capacitor (150) serves to isolate the first terminal (120) of the differential input from a direct current voltage applied to the second terminal of the one said diode, and wherein the second capacitor (155) serves to isolate the second terminal (130) of the differential input from a direct current voltage applied to the first terminal of the one said diode.
- The circuit recited in Claim 1, wherein the plurality of diodes are bipolar complementary metal oxide semiconductor diodes.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/971,770 US5880643A (en) | 1997-11-17 | 1997-11-17 | Monolithic high frequency voltage controlled oscillator trimming circuit |
US971770 | 1997-11-17 | ||
PCT/SE1998/002024 WO1999026335A1 (en) | 1997-11-17 | 1998-11-10 | Monolithic high frequency voltage controlled oscillator trimming circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1032970A1 EP1032970A1 (en) | 2000-09-06 |
EP1032970B1 true EP1032970B1 (en) | 2003-04-02 |
Family
ID=25518773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98958422A Expired - Lifetime EP1032970B1 (en) | 1997-11-17 | 1998-11-10 | Monolithic high frequency voltage controlled oscillator trimming circuit |
Country Status (18)
Country | Link |
---|---|
US (1) | US5880643A (en) |
EP (1) | EP1032970B1 (en) |
JP (1) | JP4008657B2 (en) |
KR (1) | KR100602453B1 (en) |
CN (1) | CN1146101C (en) |
AR (1) | AR017620A1 (en) |
AU (1) | AU740649B2 (en) |
BR (1) | BR9814969A (en) |
CA (1) | CA2310416A1 (en) |
CO (1) | CO4810357A1 (en) |
DE (1) | DE69813006D1 (en) |
EE (1) | EE200000233A (en) |
HK (1) | HK1033869A1 (en) |
IL (1) | IL136169A0 (en) |
MY (1) | MY118201A (en) |
NO (1) | NO20002264L (en) |
RU (1) | RU2204194C2 (en) |
WO (1) | WO1999026335A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9916907D0 (en) | 1999-07-19 | 1999-09-22 | Cambridge Silicon Radio Ltd | Variable oscillator |
GB9916901D0 (en) * | 1999-07-19 | 1999-09-22 | Cambridge Silicon Radio Ltd | Adjustable filter |
AU2000266379A1 (en) * | 1999-08-10 | 2004-01-06 | Qualcomm Incorporated | Band switchable intermediate frequency band pass filter |
FI109641B (en) * | 2000-03-10 | 2002-09-13 | Nokia Corp | microphone structure |
US6603366B2 (en) * | 2001-08-10 | 2003-08-05 | Texas Instruments Incorporated | Trimmable oscillator |
US20040029129A1 (en) * | 2001-10-25 | 2004-02-12 | Liangsu Wang | Identification of essential genes in microorganisms |
JP5053579B2 (en) * | 2006-06-28 | 2012-10-17 | 寛治 大塚 | ESD protection circuit |
US8275336B2 (en) * | 2010-06-23 | 2012-09-25 | Richwave Technology Corp. | Apparatus and method for digitally controlling capacitance |
RU2622628C1 (en) * | 2016-08-03 | 2017-06-16 | Геннадий Сендерович Брайловский | Frequency tuning method and phase detector |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2033181A (en) * | 1978-09-20 | 1980-05-14 | Hitachi Ltd | High-frequency electronic switch circuit |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3319187A (en) * | 1966-04-06 | 1967-05-09 | Simmonds Precision Products | Voltage controlled oscillator utilizing transmission-line switching elements |
US3668553A (en) * | 1970-06-26 | 1972-06-06 | Varian Associates | Digitally tuned stripline oscillator |
US4186360A (en) * | 1977-02-18 | 1980-01-29 | Sanyo Electric Co., Ltd. | Digital channel selecting apparatus |
JP2580116B2 (en) * | 1985-12-16 | 1997-02-12 | ソニー株式会社 | IC integrated high frequency variable frequency oscillation circuit |
US4973922A (en) * | 1987-11-27 | 1990-11-27 | At&T Bell Laboratories | Voltage controlled variable capacitor and oscillator using it |
FR2649505B1 (en) * | 1989-07-07 | 1991-10-25 | Sgs Thomson Microelectronics | INTEGRATED CIRCUIT WITH ADJUSTABLE OSCILLATOR WITH FREQUENCY INDEPENDENT OF THE SUPPLY VOLTAGE |
US5166645A (en) * | 1992-01-15 | 1992-11-24 | Quartzdyne, Inc. | Differential mixer oscillator |
US5384553A (en) * | 1993-05-10 | 1995-01-24 | Rohm Co., Ltd. | Voltage control oscillation circuit |
DE4314424A1 (en) * | 1993-05-03 | 1994-11-10 | Philips Patentverwaltung | oscillator |
SE517185C2 (en) * | 1993-12-28 | 2002-05-07 | Ericsson Telefon Ab L M | Component module adapted oscillating circuit device |
US5483195A (en) * | 1994-10-20 | 1996-01-09 | Northern Telecom Limited | Second generation low noise microwave voltage controlled oscillator |
-
1997
- 1997-11-17 US US08/971,770 patent/US5880643A/en not_active Expired - Lifetime
-
1998
- 1998-11-05 MY MYPI98005032A patent/MY118201A/en unknown
- 1998-11-10 KR KR1020007005292A patent/KR100602453B1/en not_active IP Right Cessation
- 1998-11-10 AU AU14478/99A patent/AU740649B2/en not_active Ceased
- 1998-11-10 EE EEP200000233A patent/EE200000233A/en unknown
- 1998-11-10 EP EP98958422A patent/EP1032970B1/en not_active Expired - Lifetime
- 1998-11-10 RU RU2000115567/09A patent/RU2204194C2/en not_active IP Right Cessation
- 1998-11-10 CA CA002310416A patent/CA2310416A1/en not_active Abandoned
- 1998-11-10 BR BR9814969-5A patent/BR9814969A/en not_active IP Right Cessation
- 1998-11-10 CN CNB988107880A patent/CN1146101C/en not_active Expired - Fee Related
- 1998-11-10 DE DE69813006T patent/DE69813006D1/en not_active Expired - Lifetime
- 1998-11-10 IL IL13616998A patent/IL136169A0/en unknown
- 1998-11-10 CO CO98066144A patent/CO4810357A1/en unknown
- 1998-11-10 WO PCT/SE1998/002024 patent/WO1999026335A1/en active IP Right Grant
- 1998-11-10 JP JP2000521585A patent/JP4008657B2/en not_active Expired - Fee Related
- 1998-11-13 AR ARP980105777A patent/AR017620A1/en unknown
-
2000
- 2000-04-28 NO NO20002264A patent/NO20002264L/en not_active Application Discontinuation
-
2001
- 2001-06-21 HK HK01104338A patent/HK1033869A1/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2033181A (en) * | 1978-09-20 | 1980-05-14 | Hitachi Ltd | High-frequency electronic switch circuit |
Also Published As
Publication number | Publication date |
---|---|
WO1999026335A1 (en) | 1999-05-27 |
BR9814969A (en) | 2000-10-03 |
AR017620A1 (en) | 2001-09-12 |
NO20002264L (en) | 2000-05-18 |
KR20010024645A (en) | 2001-03-26 |
AU1447899A (en) | 1999-06-07 |
CN1146101C (en) | 2004-04-14 |
CA2310416A1 (en) | 1999-05-27 |
IL136169A0 (en) | 2001-05-20 |
CO4810357A1 (en) | 1999-06-30 |
JP2001523907A (en) | 2001-11-27 |
NO20002264D0 (en) | 2000-04-28 |
JP4008657B2 (en) | 2007-11-14 |
AU740649B2 (en) | 2001-11-08 |
KR100602453B1 (en) | 2006-07-19 |
DE69813006D1 (en) | 2003-05-08 |
RU2204194C2 (en) | 2003-05-10 |
US5880643A (en) | 1999-03-09 |
CN1278372A (en) | 2000-12-27 |
EP1032970A1 (en) | 2000-09-06 |
EE200000233A (en) | 2001-06-15 |
HK1033869A1 (en) | 2001-09-28 |
MY118201A (en) | 2004-09-30 |
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